Carburetor



May 2, 1933. vE. MONTGOMERY 1,905,278,

GARBURETOR Original Filed Dec. 10. 1924 204. J0L 2017'al y l 21 21 Z2 INVENToR' 4. 7/ Z5\\\/ V Cyl/wund 25 wig? Patented Mayv 2, 1933 UNITED s'rasras PATENT; vori-'loa EDMUND v HONTGOHERY, OF DETROIT, MICHIGAN, ASSIGNOR TC SCIETE DU CARBUBA'TEUR ZENITH, 0F LYON, FRANCE, A CORPQRATION 0F FRANCE CARBURETOR Application led December 10, 1924, Serial No. 754,980. Renewed March y123, 1932.

The present invention relates broadly to carburetors, and more particularly to an improved carburetor construction adapted to effect better distribution and atomization of the fuel supplied for priming purposes or .low speed running.

At the present time it is customary in the art to construct carburetors having a mixing chamber, the outlet of which is adapted to be controlled by a throttle. In many of such carburetors, there is provided a priming or idling channel which communicates with the mixing chamber adjacent one edge of the throttle when in closed position.

As the throttle is gradually opened, it provides two small crescent-shaped openings on opposite sides thereof through which the air passes with comparatively high velocity. Due tothe location of the priming channel or low speed feeding device, substantially all of the fuel is fed through one of these crescent-shaped openings, thereby resulting in ineiiicient distribution of the fuel. It is one of the objects of the present invention to provide a carburetor in which the fuel through such channel will be more effectively distributed, whereby a more nearly uniform mixture is supplied to each of the cylinders with which the carburetor is used.

In the accompanying drawing there are shown, for purposes of illustration only, certain preferred embodiments of the present invention, it being understood that the drawings do not define the limits of the invention, and that changes in the construction and operation therein disclosed may be made without departing either from the spirit of the invention or the scope of the broader claims.

In the drawing Figure 1 is a diagrammatic View .illustrating one embodiment of the invention;

Figure 2isV a sectional view through a portion of a mixing chamber illustrating another embodiment ofthe invention, and

Figures 3 to 11, both inclusive, are transverse sectional views through a throttle parallel to the throttle shaft or through blanks from which throttles are adapted to be' formed.

In carrying out the present invention, as illustrated, for example, in Figure l of the drawing, the mixing chamber 2 may have a controlling throttle '3 for determining the volume ofl flow from the carburetor. Cooperating with one side ofthe mixing chamber, adjacent the portion of the wall with which one edge of :the throttle contacts when in closed position, is the usual priming or slow speed channel 4. As the throttle is moved toward open position, it will be -apparent that it provides a crescent-shaped iiow opening, not only adjacent the channel 4, but also adjacent the opposite edge of the throttle. Normally, a mixture of air and fuel flows through one of theseopenings, due to the.

in a channel y6 adjacent the opposite edge of..

the throttle. In this manner a mixture of fuel and air will flow through each of the openings provided when the throttle is in partially open position, with correspondingly greater uniformity of fuel distribution.

I-n Figure 2 the channel 4 cooperates with the throttle 3 in the manner heretofore described. In order, however, to obviate the necessity of providing a separate conduit similar to the conduit 5, the throttle is provided with a substantially diametrically extending opening 7, one end of which is substantially in alignmentf with the axis of the channel 4', and the opposite end of which discharges at the other side of the throttle. By reason of this construction, the high velocity of the air flowing to the opening adjacent the channel 4 sucks fuel from this channel and forms the desired mixture for this partcula.l throttle opening. At the same time, the suction created through the opening 7 'draws fuel through the throttle body and delivers it to the opening 8, the throttle in this ligure being represented in slightly open position.

In Figure 3 the throttle body 9 is illustrated as formed of suitable material having a chan'- channel being closed by a dovetailed cover 11.

In Figure 4 there is illustrated a slightly differentembodiment of the invention, in which the channel 10 is closed by a cover 11 which may be welded, soldered or otherwise secured in position.

The form of the invention illustrated in Figure' 5 comprises a body formed of two similar sections 12, each having a groove 13` formed therein, which grooves are adapted to form an enclosed opening when the sections are secured in superimposed relation.

Figure 6 illustrates another modification in which the sections 12 are of different thicknesses throughout the different portions thereof, whereby when overlapped, they provide an opening 13.

The-V throttlel illustrated in Figure 7 shown as composed of four separate pieces 14,

15', 16 and 17. "The pieces 14 and l5 may be identical, whereby during assembly the parts are interchangeable. The piece 16 is formed of relatively light gauge material shaped to provide an offset 18 forming an opening 19, the channel being closed by the cover piece 17.

Figure `8 illustrates another four-piece `structure in which the sections 14 and 15 are interchangeable. they having secured on opposite sides thereof covers 17 which may likewise be interchangeable. The parts are so dimensioned as to provide a transversely extending opening' 19'..

In the throttle construction of Figure 9, which is generally similar to that shown in Figure 8, the sections 14a and 146 are each formed with relatively thinner intermediate portions 20 and the cover plates 17aA are formed with depressions cooperating therewith. This construction serves to'more effectively interlock the parts, and at the same time facilitates spot welding where, this method of attaching the individual p ijeces is utilized. -v

The throttle illustrated in Figure 10..inayv conveniently be Vformed of. a single iece of material folded upon itself to provi e oppo:

sitelyrudisposed inwardly extending folded portions 21 with cooperating cover portions 22.

In Figure 11 the throttle is illustrated as formed from a. curved blank 23 originally formed with a channel 24, which, when the blank is flattened to final position, forms a closed opening 25.

It will be understood that with all of the forms of the invention illustrated in Figures 2 to 11, an elongated blank may first be formed and the individual throttles subsequently blanked therefrom by punching or any other desired operation.

'lhe advantages of the present inventionl arise from the provision of a carburetor s0 constructed that the priming or idling fuel is more uniforml distributed to the air streams, thereby effecting better atomization of the fuel and correspondingly greater uniformity in the mixture delivered.

I claim:

1. A carburetor comprising in combination a main nozzle, an auxiliary nozzle, a main mixture conduit, an auxiliary mixture conduit having a terminal orifice in the wall of said main conduit, and a valve operable to gradually uncover the terminal orifice of the auxiliary conduit and to simultaneously open the main conduit, said valve having a passage therethrough positioned to coact with said terminal orifice.

2. A carburetor comprising in ,combination a -main nozzle, an auxiliary nozzle, a main mixture conduit, an auxiliary mixture conduit having a terminal orifice in the wall of said main mixture conduit, a butterfly valve operable to gradually uncover the terminal orifice of the auxiliary conduit while simultaneously opening the main conduit, said valve havinga passage positioned so as to transmit depressions on the suction side of 

